Much more work to be done. New questions about flight 370's final moments and those key nine minutes of no communication, but the plane still showing up on the radar. ABC's David Kerley is live in Washington with the latest on this, good morning to you, David. Reporter: Lara, we learned U.S. Aviation investigators have seen all the radar data the Malaysians have but still this mystery which led to a discussion of possible theories because of these missing nine minutes. Something happened to this triple 7's ability to report to the ground. Was that because of a massive electrical failure? Was the crew incapacitated because of a lack of oxygen or did the crew turn off equipment? All questions raised by the missing nine minutes. We know the plane too off from Kuala Lumpur at 12:41 A.M. 40 minutes later, the 777's transponder's signaling device sent its last bit of information, location and altitude at 35,000 feet. Then the transponder goes silent but for another nine minutes, radar continues to see the plane moving until 1:30 A.M. When it disappears. The Malaysian military says 45 minutes later, its radar tapes show something way over here on the other side of the Malaysian peninsula. But they admit they have no idea what it is. As the general said it's very difficult for us to say for sure it is the aircraft. Among the U.S. Investigators, part of the team from the ntsb, the FAA and Boeing is a radar expert who got a first look at that radar data. There have been plenty of questions about the split search on both sides of the Malaysian peninsula. The Malaysians say today they were told by the U.S. Investigators who now looked at this data that there were grounds to search on both sides including the malacca strait. Let's analyze this with

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